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Lack of and loss of heat 900 2004

posted by  robertmfranklin on  Wed Feb 19 20:36 CST 2014
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last visit: Sun Sep 28 16:46 CST 2014
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Im in New England. Enuf said. The engine comes up to temperature and the heater sometimes is fine. But then it will loose temperature completely and only blow cold air. Then it will go back to working, but lately and increasingly less often.

I've read the FAQs. Somehow I don't think it is a thermostat issue, but it could be. My mind is dwelling on the water control valve. Maybe I'm not using the right term, but a year ago I replaced the 2 heater hoses that go into the fire wall and at some time the plastic valve failed loosing all the coolant. I replaced the valve and didn't pay attention to the FAQ recommendation to get a quality valve. I think I paid 15 for the valve, which look just like the broken one.

Sometimes I get heat sometimes, not. So it seems the problem must be something that changes, but not doing so consistently. Would that be my cheap valve?

Bob Franklin








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    Lack of and loss of heat 900 2004

    posted by  roger on  Mon Feb 24 18:13 CST 2014
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    last visit: Fri Sep 12 22:18 CST 2014
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    I have a '93 940, and it will do this if the coolant is low.

    I had a failing radiator last year, and when the coolant would leak out, I would lose interior heat. Filling it back up, then revving the engine (there's an air bubble that you have to push out) would fix it for me. Until it leaked out again. (New radiator fixed that...)

    Roger

    2005 XC90 V8 79k
    1995 854T 265k
    1993 945T 222k
    1987 245 300k+ sold and still going








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    Lack of and loss of heat 900 2004

    posted by  someone claiming to be Mikey two Volvos on  Sat Feb 22 10:25 CST 2014 [RELATED]

    When you have no heat, stop the car and feel the two pipes going into and out of the bulkhead (firewall) If both are warm then the matrix is getting coolant.If one is cold and the top is warm, then you might have an intermittant blockage, or the valve might be faulty. If the pipes are good and the matrix is clear and its cold in the car, then it might be that the venting has failed in some way, routing the hot air away.Check the movement of the shutters behindthe dash. To check the valve yOu can get down intothe footwell (passenger side on a US car) and I think you can see the valve operating when someone works the heater controls. After about 16 years the matrices fail anyway, as I know to my cost with both a 700 and 900 series car...its a process of elimination which is not much fun but don't give up!








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    Lack of and loss of heat 900 2004

    uid 55's pic
    posted by  john sargent on  Thu Feb 20 14:18 CST 2014
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    last visit: Wed Oct 22 09:07 CST 2014
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    There is a short rubber hose connecting to the heater valve, make sure it is connected. Also make sure the hard plastic vacuum line, which the hose connects to, does not have a hole chafed in it.
    --
    john








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    Lack of and loss of heat 900 2004

    posted by  Chris Mullet on  Thu Feb 20 09:32 CST 2014
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    Is the coolant level up to the proper level? Also, is the engine temp gauge reading approx mid point when the car has been running for several minutes?








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    Lack of and loss of heat 900 2004

    posted by  Steve on  Thu Feb 20 07:31 CST 2014
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    Bob, if the temperature gauge shows anything above the first red line after you let the car run for a while, then it sounds like your hot water valve is failing. Pay attention to the routing of the hoses (see the FAQ) and the vacuum line installation. Unless you have a heated garage you should wait for a warm day to do this.
    --
    See the 700/900 "FAQ" at the menu bar top screen left side.







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